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Manali, a hill resort in the Kullu District of Himachal Pradesh state is a success story for the solar water heating industry. Presently around 1.5 lakh LPD of SWH systems is installed in hotel segment in Manali.
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The extent of proliferation can be seen by the following observations.
- Steady growth was
experienced in the number of SWH installations
in the last 5 years. The total installations in
hotels have crossed 150000 LPD.
- Almost 20% of the
hotels have installed SWHS in capacities of
1000-12000 LPD.
- The hotels using SWH
systems are able to meet about 25-50% of the
annual requirement for hot water by the SWH
systems.
- Most of the owners are
satisfied with the systems performance. Many
have gone in for additional capacities. Most
have calculated paybacks of less than 4 years.
- New areas of SWH application are being explored i.e. Kitchens, laundry, Space Heating and Swimming pool heating.
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A 20 room hotel in the heart of the city has a 1000 LPD flat plate SWH system supplying hot water against a daily requirement of 3000 LPD which was totally being supplied by the diesel boiler previously. The system was installed 1.5 years back and roof space constraints the capacity was limited to 1000 LPD. Although the management reported estimated savings of Rs. 1 lakh yearly they were not fully satisfied with the quality of the after- sale service.
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Welham boys school has installed a total of 5500 (2500 + 1500 +1500) LPD ETC based system in 2009. The system provides hot water to three of the hostels of 200, 150 and 150 student capacity respectively. The system performance has been good. The SWH system replaced the wood boiler and it is now acting as a back-up heating system which is operated in case of cloudy weather.
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Located at Bhagsu near McLeodganj, this was one of the first establishment of the area to install the system back in 2006. A 1000 LPD flat plate system with heat exchanger is providing hot water to 6 rooms out of the 15 in the hotel. The user is quiet satisfied with the system and the pay-back period is less than 3.0 years. There is a potential to improve the system performance by improving the insulation.
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In view of the high cost of heating water through electric geysers, due to high electricity tarrifs, and shortage of electricity, Mr. Wangdi has installed a 200 LPD flat plate SWH system in 2009. The already installed electric geyser is now acting as a back-up system. The SWH has a supply point in the bathroom as well as the kitchen. The system is in a very good shape and its performance is up to the mark till now. As per the owners view they are able to get hot water from SWH system for 200-250 days in a year.
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Dharma Chakra Center is a monastery governed residential school established in East Sikkim in the year 1965. It has an approximate capacity of 180 students and a morning bathing schedule. The hot water requirement is for bathing, kitchen cooking and washing purposes. In order to reduce the consumption and dependence on electricity in an environment friendly way, a 2000 LPD SWH system is installed to take care of the bathing and kitchen hot water requirements in 2009. The SWH system provides hot water to bathrooms for bathing and in Mess for cooking and washing purposes. Already installed Electric geysers in bathrooms and kitchen act as auxiliary support for the non sunny days. The user is partially satisfied with the performance of the system as they are not able to get the requisite temperature of water due to high over-night heat losses and cold water mixing in the tank.
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General medical hospital is one of the oldest and largest hospitals in Arunachal Pradesh. The hot water is required for bathing of patients and their attendants in wards, hand washing and sterilization of equipments in operation theatre, kitchen and laundry purposes. The requirement of hot water is round the year. To reduce the consumption and dependence on electricity for heating water in an environment friendly way, a 2000 LPD ETC based solar water heater system is installed to provide hot water in the operation theater in 2009. The already installed electric storage geysers act as an auxiliary support for the non sunny days. The user is partially satisfied with the performance of the system.
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Tawang Public School is a residential school established in Tawang. It has an approximate capacity of 212 students. The hot water requirement is for bathing, kitchen cooking and washing, laundry and drinking purposes. In order to reduce the consumption and dependence on electricity in an environment friendly way, a 2000 LPD ETC based SWH system is installed to take care of bathing and kitchen hot water requirements in 2009. The SWH system provides hot water in Kitchen for cooking and washing purposes. Already installed Electric geysers in kitchen act as auxiliary support for the non sunny days. The user feel that system is undersized and therefore it is not able to fully meet the demand.
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